/Engine/Source/Runtime/Slate/Public/Widgets/Text/SlateEditableTextLayout.h
Query to see if the text under the given position is currently selected (the position is local to the text layout space)
bool IsTextSelectedAt ( const [UE::Slate::FDeprecateVector2DParameter](API\Runtime\SlateCore\Types\FDeprecateVector2DParameter) & InLocalPosition ) const